Beyond buzz-pollination – departures from an adaptive plateau lead to new pollination syndromes

Autor(en)
Agnes S. Dellinger, Marion Chartier, Diana Fernández-Fernández, Darin S. Penneys, Marcela Alvear, Frank Almeda, Fabián A. Michelangeli, Yannick Staedler, W. Scott Armbruster, Jürg Schönenberger
Abstrakt

Summary Pollination syndromes describe recurring adaptation to selection imposed by distinct pollinators. We tested for pollination syndromes in Merianieae (Melastomataceae), which contain bee- (buzz-), hummingbird-, flowerpiercer-, passerine-, bat- and rodent-pollinated species. Further, we explored trait changes correlated with the repeated shifts away from buzz-pollination, which represents an ?adaptive plateau? in Melastomataceae. We used random forest analyses to identify key traits associated with the different pollinators of 19 Merianieae species and estimated the pollination syndromes of 42 more species. We employed morphospace analyses to compare the morphological diversity (disparity) among syndromes. We identified three pollination syndromes (?buzz-bee?, ?mixed-vertebrate? and ?passerine?), characterized by different pollen expulsion mechanisms and reward types, but not by traditional syndrome characters. Further, we found that ?efficiency? rather than ?attraction? traits were important for syndrome circumscription. Contrary to syndrome theory, our study supports the pooling of different pollinators (hummingbirds, bats, rodents and flowerpiercers) into the ?mixed-vertebrate? syndrome, and we found that disparity was highest in the ?buzz-bee? syndrome. We conclude that the highly adaptive buzz-pollination system may have prevented shifts towards classical pollination syndromes, but provided the starting point for the evolution of a novel set of distinct syndromes, all having retained multifunctional stamens that provide pollen expulsion, reward and attraction.

Organisation(en)
Department für Botanik und Biodiversitätsforschung
Externe Organisation(en)
Herbario Nacional del Ecuador, University of North Carolina at Wilmington, California Academy of Sciences, Institute of Systematic Botany, The New York Botanical Garden, University of Portsmouth, University of Alaska, Fairbanks (UAF)
Journal
New Phytologist
Band
221
Seiten
1136-1149
Anzahl der Seiten
14
ISSN
0028-646X
DOI
https://doi.org/10.1111/nph.15468
Publikationsdatum
01-2019
Peer-reviewed
Ja
ÖFOS 2012
106042 Systematische Botanik, 106008 Botanik, 106012 Evolutionsforschung
Schlagwörter
Link zum Portal
https://ucris.univie.ac.at/portal/de/publications/beyond-buzzpollination--departures-from-an-adaptive-plateau-lead-to-new-pollination-syndromes(7e7755e5-12d4-4bd3-9b2d-498bcac8f87d).html